kernel/fs/btrfs/transaction.h

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #ifndef __BTRFS_TRANSACTION__
  20 #define __BTRFS_TRANSACTION__
  21 #include "btrfs_inode.h"
  22 #include "delayed-ref.h"
  23 #include "ctree.h"
  24
  25 enum btrfs_trans_state {
  26         TRANS_STATE_RUNNING             = 0,
  27         TRANS_STATE_BLOCKED             = 1,
  28         TRANS_STATE_COMMIT_START        = 2,
  29         TRANS_STATE_COMMIT_DOING        = 3,
  30         TRANS_STATE_UNBLOCKED           = 4,
  31         TRANS_STATE_COMPLETED           = 5,
  32         TRANS_STATE_MAX                 = 6,
  33 };
  34
  35 #define BTRFS_TRANS_HAVE_FREE_BGS       0
  36 #define BTRFS_TRANS_DIRTY_BG_RUN        1
  37 #define BTRFS_TRANS_CACHE_ENOSPC        2
  38
  39 struct btrfs_transaction {
  40         u64 transid;
  41         /*
  42          * total external writers(USERSPACE/START/ATTACH) in this
  43          * transaction, it must be zero before the transaction is
  44          * being committed
  45          */
  46         atomic_t num_extwriters;
  47         /*
  48          * total writers in this transaction, it must be zero before the
  49          * transaction can end
  50          */
  51         atomic_t num_writers;
  52         atomic_t use_count;
  53         atomic_t pending_ordered;
  54
  55         unsigned long flags;
  56
  57         /* Be protected by fs_info->trans_lock when we want to change it. */
  58         enum btrfs_trans_state state;
  59         struct list_head list;
  60         struct extent_io_tree dirty_pages;
  61         unsigned long start_time;
  62         wait_queue_head_t writer_wait;
  63         wait_queue_head_t commit_wait;
  64         wait_queue_head_t pending_wait;
  65         struct list_head pending_snapshots;
  66         struct list_head pending_chunks;
  67         struct list_head switch_commits;
  68         struct list_head dirty_bgs;
  69         struct list_head io_bgs;
  70         struct list_head dropped_roots;
  71         u64 num_dirty_bgs;
  72
  73         /*
  74          * we need to make sure block group deletion doesn't race with
  75          * free space cache writeout.  This mutex keeps them from stomping
  76          * on each other
  77          */
  78         struct mutex cache_write_mutex;
  79         spinlock_t dirty_bgs_lock;
  80         /* Protected by spin lock fs_info->unused_bgs_lock. */
  81         struct list_head deleted_bgs;
  82         spinlock_t dropped_roots_lock;
  83         struct btrfs_delayed_ref_root delayed_refs;
  84         int aborted;
  85 };
  86
  87 #define __TRANS_FREEZABLE       (1U << 0)
  88
  89 #define __TRANS_USERSPACE       (1U << 8)
  90 #define __TRANS_START           (1U << 9)
  91 #define __TRANS_ATTACH          (1U << 10)
  92 #define __TRANS_JOIN            (1U << 11)
  93 #define __TRANS_JOIN_NOLOCK     (1U << 12)
  94 #define __TRANS_DUMMY           (1U << 13)
  95
  96 #define TRANS_USERSPACE         (__TRANS_USERSPACE | __TRANS_FREEZABLE)
  97 #define TRANS_START             (__TRANS_START | __TRANS_FREEZABLE)
  98 #define TRANS_ATTACH            (__TRANS_ATTACH)
  99 #define TRANS_JOIN              (__TRANS_JOIN | __TRANS_FREEZABLE)
 100 #define TRANS_JOIN_NOLOCK       (__TRANS_JOIN_NOLOCK)
 101
 102 #define TRANS_EXTWRITERS        (__TRANS_USERSPACE | __TRANS_START |    \
 103                                  __TRANS_ATTACH)
 104
 105 #define BTRFS_SEND_TRANS_STUB   ((void *)1)
 106
 107 struct btrfs_trans_handle {
 108         u64 transid;
 109         u64 bytes_reserved;
 110         u64 chunk_bytes_reserved;
 111         unsigned long use_count;
 112         unsigned long blocks_reserved;
 113         unsigned long blocks_used;
 114         unsigned long delayed_ref_updates;
 115         struct btrfs_transaction *transaction;
 116         struct btrfs_block_rsv *block_rsv;
 117         struct btrfs_block_rsv *orig_rsv;
 118         short aborted;
 119         short adding_csums;
 120         bool allocating_chunk;
 121         bool can_flush_pending_bgs;
 122         bool reloc_reserved;
 123         bool sync;
 124         unsigned int type;
 125         /*
 126          * this root is only needed to validate that the root passed to
 127          * start_transaction is the same as the one passed to end_transaction.
 128          * Subvolume quota depends on this
 129          */
 130         struct btrfs_root *root;
 131         struct seq_list delayed_ref_elem;
 132         struct list_head qgroup_ref_list;
 133         struct list_head new_bgs;
 134 };
 135
 136 struct btrfs_pending_snapshot {
 137         struct dentry *dentry;
 138         struct inode *dir;
 139         struct btrfs_root *root;
 140         struct btrfs_root *snap;
 141         struct btrfs_qgroup_inherit *inherit;
 142         /* block reservation for the operation */
 143         struct btrfs_block_rsv block_rsv;
 144         u64 qgroup_reserved;
 145         /* extra metadata reseration for relocation */
 146         int error;
 147         bool readonly;
 148         struct list_head list;
 149 };
 150
 151 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
 152                                               struct inode *inode)
 153 {
 154         spin_lock(&BTRFS_I(inode)->lock);
 155         BTRFS_I(inode)->last_trans = trans->transaction->transid;
 156         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
 157         BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
 158         spin_unlock(&BTRFS_I(inode)->lock);
 159 }
 160
 161 /*
 162  * Make qgroup codes to skip given qgroupid, means the old/new_roots for
 163  * qgroup won't contain the qgroupid in it.
 164  */
 165 static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans,
 166                                          u64 qgroupid)
 167 {
 168         struct btrfs_delayed_ref_root *delayed_refs;
 169
 170         delayed_refs = &trans->transaction->delayed_refs;
 171         WARN_ON(delayed_refs->qgroup_to_skip);
 172         delayed_refs->qgroup_to_skip = qgroupid;
 173 }
 174
 175 static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans)
 176 {
 177         struct btrfs_delayed_ref_root *delayed_refs;
 178
 179         delayed_refs = &trans->transaction->delayed_refs;
 180         WARN_ON(!delayed_refs->qgroup_to_skip);
 181         delayed_refs->qgroup_to_skip = 0;
 182 }
 183
 184 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
 185                           struct btrfs_root *root);
 186 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
 187                                                    unsigned int num_items);
 188 struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv(
 189                                         struct btrfs_root *root,
 190                                         unsigned int num_items,
 191                                         int min_factor);
 192 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
 193                                         struct btrfs_root *root,
 194                                         unsigned int num_items);
 195 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 196 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 197 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
 198 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
 199                                         struct btrfs_root *root);
 200 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 201 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 202
 203 void btrfs_add_dead_root(struct btrfs_root *root);
 204 int btrfs_defrag_root(struct btrfs_root *root);
 205 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
 206 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 207                              struct btrfs_root *root);
 208 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 209                                    struct btrfs_root *root,
 210                                    int wait_for_unblock);
 211 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 212                                    struct btrfs_root *root);
 213 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 214                                  struct btrfs_root *root);
 215 void btrfs_throttle(struct btrfs_root *root);
 216 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 217                                 struct btrfs_root *root);
 218 int btrfs_write_marked_extents(struct btrfs_root *root,
 219                                 struct extent_io_tree *dirty_pages, int mark);
 220 int btrfs_wait_marked_extents(struct btrfs_root *root,
 221                                 struct extent_io_tree *dirty_pages, int mark);
 222 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 223 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 224 void btrfs_put_transaction(struct btrfs_transaction *transaction);
 225 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
 226 void btrfs_add_dropped_root(struct btrfs_trans_handle *trans,
 227                             struct btrfs_root *root);
 228 #endif